Typewriting machine



Feb. 16, 1932. I B. J. DOWD TYPEWRITING MACHINE Filed March 21', 1930 4 Sheets-Sheet l .III IIIH I INVENT fierrzard Feb. 16, 1932.

B. J. DQWD TYPEWRITING MACHINE Filed March 21, 193'o 4 Sheets-Sheet 2 INVENTOR Bernard dfiowd,

ATTORNEYS Feb. 16, 1932 B. J. DOWD 1,845,402 Q TYPEWRITING MACHINE 4 Sheets-Sheet 3 Filed March 21, 1930 INVENTOR Bernard lfidw,

ATTORNEYS Feb. 16,1932. B. J. DOWD 1,845,402 7 i TYP EWRITING MACHINE Filed March 21, 1950 4 Sheets-Sheet 4 A'ITORN EYS Patented Feb. 16, 1932 UNITED STATES PATENT OFFICE BERNARD J. DOWD, OF'HARTFORID, CONNECTICUT, ASSIGNOR TO ROYAL TYPE'WBITER COMPANY, INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK TYPEWRITING MACHINE Application filed March 21, 1930. Serial No. 437,814.

This invention relates to new and useful improvements in masks for typewriting machines, and has among itsseveral objects to provide a mask which can be readily applied to a machine, and particularly to one of the a portable type, and which when applied will reduce to a minimum the entrance of dust and other foreign particles into the machine.

In the accompanying drawings:

Figure 1 is a top plan View of a typewrit ing machine'equipped with my invention;

Figure 2 is a transverse vertical section taken on the line 2-2 of Figure 1;

v Figure 3 is a longitudinal sectional View taken on the irregular line 33 of Figure 1;

Figure 4 is a detail vertical sectional view taken on the line 4-4 of Figure 3;

Figure 5 is a detail horizontal sectional view showing the means for connecting one of the segment dust covers with the side wall of the mask and with the segment;

Figure 6 is a detail horizontal sectional view through one of the side plates of the mask and showing the rear plate or wall of the main frame, and the rear plate of the mask;

Figure 7 is a perspective view of the mask;

Figure 8 is a perspective view showing the vertical and horizontal plates of the mask in separated relation;

Figure 9 is a perspective view of one of the segment dust covers;

Figure 10 is a perspective view of one of theribbon spool covers;

Figure 11 is a perspective view ofa latch and link which is adapted to be connected to the associated ribbon spool cover;

Figure 12 is a perspective view showing the hinge parts for one of the ribbon spool covers;

Figure 13 is a perspective view of the front plate of the mask;

Figure 14 is a perspectiveview of one of the side plates of the mask;

Figure 15 is a perspective View of the key lever guard of the mask;

, jFigure 16 is a detail sectional view showing a modified means for limiting the opening movement of the ribbon spool cover;

Figure 17 is a perspectiveview of the limit ing arm shown in Figure 16; and

Figure 18 is a detail sectional view showing another modified form of means for limiting the outward movement of the ribbon spool cover. w

Referring to the accompanying drawings, my invention is directed to a dust protector or mask A which is applied to a typewriting machine designated generally by the reference letter B. In these drawings I have plates 55 in the usual manner is a type bar segment 7, and pivotally mounted onthe segment are the usual type bars 8 and operatively connected to the type bars are key levers 9 Which,,as usual, extend forwardly of the main frame. The machine also includes the usual the main frame is a bracket 11, and supported in each bracket is a vertically disposed rib- ,platen 10. Attached to each side plate 5 of bon spool shaft 12, the upper end of which projects into a ribbon receiving cup 13. The machine is providedat its rear with the usual center stop 14 which is pivoted as at 15 on the main frame.

The dust protecting mask A is formed of sheet metal and includes side plates 1616. The rear and front ends of each side plate 16 are pressed outwardly to simulate vertically disposed columns 17 and 18 respectively. The rear end of the side plate 16 is provided with an inwardly extending flange 19 which is rigidly attached to the rear plate 6 of the main frame by a screw 20. The front end of each side plate 16 is pressed inwardly to form a front wall 21 of the front column 18. This front wall 21 terminates short of the bottom of the column and is provided with an upwardly extending recess 22.

Extending upwardly from the frontiwall 21 of each side plate 16 is an attaching lug 23 which is secured by a screw 24 to the upper end of a bracket 25 rigidly attached to the associated side plate 5 of the main frame by screws 26 or the like. A front plate 27 of the mask is rigidly secured at its ends to the main frame of the machine through the medium of the screws 24.

The rear ends of the side plates 1616 are also connected by a vertical rear plate 28, the" screws 20-20 serving to rigidly connect the rear ends of the side plate 16-16 and the ends of the reai' plate 28 to the main frame of the machine. The vertical plate 28 of the mask is provided along its upper edge with forwardly extending bent-over cars 29. Supported on the ears 29 and spot-welded thereto is a horizontally disposed rear plate 30 of the mask. This plate 30 is centrally pro vided with an upstanding hood portion 31 which functions to guard the pivot 15 of the center stop 14. The plate 30 is also provided adjacent one end with an elongated opening 32 through which the usual serial number located on the rear plate or wall of the main frame is visible.

Surrounding the projecting key levers 9 is a U-shaped key lever guard 33 having its ends pressed outwardly to form off-set flanges 34-34. The rear ends of the key lever guard 33 are inserted within slots 22- 22 of the side plates 16l6, and the off-set end portions 3434 are placed against the inner faces of the outer side walls of the columns 1818 and secured thereto by spot-welding or other suitable means.

In order to efliciently guard the ribbon spools against entrance of dust or other foreign matter, I have provided ribbon spool covers 3535 which cooperate with the ribbon spool cups 13 in a manner to close said cups and thereby prevent the entrance of dust or the like. These ribbon spool covers 35 are hingedly connected to the side walls 16-16 of the mask so as to permit said covers to be swung upwardly and outwardly in order to provide ready access to the ribbon spools Whenever desired. The hinge connection between each cover 35 and the associated side wall 16 is disclosed in Figure 12 and includes hinge leaves 36 and 37 and a pintle 38, the leaves being preferably connected to the cover and side wall by spotwelding. The covers 35 are disposed directly above the upper edges of the side plate 16 and the front plate 27 and normally lie thereupon. Each cover 35 is.

provided with a downwardly extending side flange 39 and a downwardly extending front flange 40. The flange 39 projects downwardly over the hinge connection and therei by not only conceals the latter but also assists in preventing any dust from entering through the space between the sidewall and the cover due to the hinge connection. The front flange 40 conceals the screw 24 which connects the side wall 16 and the front plate 27 with the bracket 25 of the main frame.

' gated slot 53 formed therein.

thereof is a large plate 44. This plate is preferably spot-welded to the cover plate. The plate 44 terminates in one end in a cam latch finger 45, and the other end of .said

plate is provided with a downwardly extending car 46 to which one end of atoggle link 47 is pivotally. connected, the other end of the toggle link being pivotally connected to the screw 24. The cam finger 45 is positioned so that, when the cover 35 is lowered to its closing or normal position, said finger wi l. frictionally engage the associated spring or keeper 43 and thereby detachably retain the cover in its normal or operating position. The mask A also includes a pair of segment dust covers 48 48 which are each rigidly secured to the segment 7 by a screw 49 and to an inwardly extending flange 50 formed on the upper portion of the associated side wall 16 by means of a shoe 51.

Instead of employing the toggle links 47 to limit the upward and outward swinging movement of each ribbon spool cover 35, I may employ the construction shown in Figures 16 and 17 In this form the cover 35 has rigidly attached thereto, preferably by spotwelding, a depending ear 52 having an elon- A limiting finger or arm 54 is pivoted at one end to the screw 24 and the free' end of this arm is pro vided with a laterally off-set T-head 55 and connecting neck 56. The 'neck 56 projects through the slot 53 and the T-head 55 is thus held against displacement relative to the ear 52.

A still further modified form of limiting means for the cover 35 is shown in Figure 18. In this form the large plate 44 is provided with a downwardly extending arm 55 which is formed with an arcuate slot 56 for cooperation with the screw 24.

From the foregoingit will be observed that I have provided a mask which may be readily applied to an ordinary commercial typewriting machine, and which, when so applied, will reduce to a minimum the possibility of dust or other foreign particles gaining access to the interior of the machine.

I claim:

1. In a typewriter, the combination of a main frame, platen, type bars, and key levers extending forwardly of the main frame, and a protecting mask therefor including side plates and a U-shaped key lever guard separate fromthe side plates and having its rear ends rigidly connected thereto at points in rear of the side edges of the front plates, the front end of each side plate having a vertical column rigidly connected thereto, and the rear ends of the key lever guard being disposed within and rigidly connectedut-o said vertical columns.

2. In a typewriter, the combination of a main frame, platen, type bars, and key levers extending forwardly of the main frame, and a protecting mask therefor including side plates and a U-shaped key lever guard separate from the side plates and having its rear ends rigidly connected thereto at points in rear of the front edges of the side plates, the front end of each side plate being pressed outwardly to form a vertical column including an inwardly projecting flange, and the rear ends of the key lever guard having outwardly off-set portions disposed in rear of the front flanges of the side plates and rigidly connected to the outwardly pressed column portions of the side plates.

3. In a typewriter, the combination of a main frame, platen, type bars, vertically disposed ribbon spool shafts, and key levers extending forwardly of the main frame, and a protecting mask therefor including side plates and ribbon spool covers hingedly attached at their outer edges to the side plates of the mask.

4. In a typewriter, the combination of a main frame, platen, type bars, vertically disposed ribbon spool shafts and key levers extending forwardly of the main frame, and a protecting mask therefor including side plates and ribbon spool covers hingedly attached at their outer edges'to the side plates of the mask, said covers including flanges extending downwardly along the side plates and concealing the hinges.

5. In a typewriter, the combination of a main frame, platen, type bars, vertically disposed ribbon spool shafts, and key levers extending forwardly of the main frame, a protecting mask therefor including side plates and ribbon spool covers hingedly attached at their outer edges to the side plates of the mask, and releasable latches for retaining the covers in normal operative positions.

6. In a typewriter, the combination of a main frame, platen, type bars, and key levers extending forwardly of the main frame, and a protecting masktherefor including side plates, a front plate disposed above the key levers and connected to the upper portions of the frontportions of the side plates, and ribbon spool covers hingedly connected to said side plates and provided withside and front flanges extending downwardly and conextending forwardly of the main frame, and a protecting mask therefor including side plates, a front plate disposed above the key levers and connected to the upper portions of the front portions of the side plates, ribbon spool covers hingedly connected to said side plates and provided with side and front flanges extending downwardly and concealing the hinges and the connections between the front plate and the side plates, and releasable latch connections between the front plate and the ribbon spool covers for retaining the latter in normal operative positions.

8. In a typewriter, the combination of a main frame, platen, type bars, and key levers extending forwardly of the main frame, and I a protecting mask therefor including side,

plates, a front plate disposed above the key levers and connected to the upper portions of the front portions of the side plates, ribbon spool covers hingedly connected to certain of said plates, and releasable latch connections between the front plate and the ribbon spool covers for retaining the latter in normal operative position.

9. In a typewriter, the combination of a main frame, platen, type bars, and key levers extending forwardly of the main frame, and a protecting mask therefor including side plates, a front plate disposed above the key levers and connected to the upper portions of the front portions of the side plates, ribbon spool covers hingedly'connected to certain of said plates, and releasable latch connected at its ends to the front plate, and a cooperating latch finger fixed to the associated ribbon spool cover.

10. In a typewriter, the combination of a main frame, platen, type bars,and key levers extending forwardly of the main frame, anda protecting mask therefor including side plates, a front plate disposed above the key levers and connected to the upper portions of the front portions of the side plate, the upper edge of the front plate being concaved and having a flange extending rearwardly therefrom, the flange adjacent the side plates being formed with ears, ribbon spool covers hingedly connected to certain of said plates, and releasable latch connections between the front plate and the ribbon spool covers for retaining the latter in normal operative positions, said latch connections including coil springs respectively connected at one end to the ears and at their other ends to the front plate, and a cooperating latch finger fixed to the associated ribbon spool cover.

In testimony whereof, I have hereunto sub scribed my name.

BERNARD J. DOWD. 

